energy conservation

• state the law of energy conservation

  energy cannot be created or destroyed ,it can only be transferred, stored or dissipated

  
• state any changes in the total energy of a ball that is kicked assuming that no external forces act?

  the total energy of the system remains constant due to the conservation of energy.

  
• what is waste energy

  energy that is not used by the device for its desired purpose

  
• describe the energy changes that occur in a filament lightbulb?

  electrical energy is transferred to light and heat energy

  
• distinguish the useful and wasted energy in a filament lightbulb.

  light is a useful energy form.

  heat is waste energy.

  
• how can the efficiency of a system be increased?

  reducing waste output

  recycling waste output

  
• we can reduce waste output by

  lubrication and thermal insulation
• we can recycle output waste by

  recycling thermal waste as input energy